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2016-06-22 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Thai THU THUY, Recloux Isaline, Druart Marie-Eve , Trinh Anh Truc, Olivier Marie-Georges , "Compatibility between sol-gel pretreatments and epoxy primers on aluminium alloys 2024-T3 : influence of the pretreatment porosity" in 10th international symposium on Electrochemical Impedance Spectroscopy, 100, A Toxa, Spain, 2016

  • Codes CREF : Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) Chromate-based conversion treatments and chromate containing epoxy primers are traditionally used for corrosion protection of 2024 aluminum alloy (AA2024). However, hexavalent chromium Cr(VI) provokes carcinogen effects on human health and will be prohibited as from 2017 in the aircraft industry. As a consequence it becomes very urgent to develop a new generation of environmentally-friendly coating systems for AA2024. In this work, silica based sol-gel films were applied on AA2024 as surface pretreatments before the application of an epoxy primer. Non porous and porous sol-gel films were synthetized. The main objective was to highlight the role of the pretreatment porosity on the compatibility with the primer. A higher specific surface area of the pretreatment could promote adhesion between the metal and the organic primer. Mesoporous sol-gel films were synthesized via Evaporation Induced Self-Assembly (EISA) method by adding a templating agent in the sol-gel formulation. Two different templating agents were used: Pluronic F108 and P123 to synthesize sol-gel films with different pore sizes. The characterization of the porosity inside the film (pore volume, specific surface area, pore diameter) was performed by adsorption porosimetry using a quart crystal microbalance. The adhesion strength was studied using “cross-up” method and pull-off test. The electrochemical behavior of AA2024 samples pre-treated and painted with epoxy coating was studied using electrochemical impedance spectroscopy.